HypercapniaCell HypoxiaAnoxiaCarbon DioxideOxygenChemoreceptor CellsRespirationHypoxia, BrainPulmonary VentilationAcidosis, RespiratoryPartial PressureHypocapniaFetal HypoxiaRespiratory MechanicsCerebrovascular CirculationBlood Gas AnalysisApneaAcidosisHypoxia-Inducible Factor 1, alpha SubunitTidal VolumeHyperoxiaAcid-Base EquilibriumCarotid BodyPia MaterHypoxia-Inducible Factor 1AsphyxiaHyperventilationHydrogen-Ion ConcentrationPhrenic NerveOxygen ConsumptionAnimals, NewbornRats, Sprague-DawleySodium CyanidePlethysmography, Whole BodyDiaphragmBlood PressureHypoventilationRespiratory Physiological PhenomenaAltitudeHeart RateRespiratory MusclesCerebral ArteriesMedulla OblongataRespiratory CenterPulmonary ArteryRespiration, ArtificialRespiratory InsufficiencyTime FactorsAcetazolamideBrain StemPulmonary Gas ExchangeIntercostal MusclesDoxapramVasodilationBlood Flow VelocityPulmonary CirculationBrainOximetryBicarbonatesVagotomyCarbonic Anhydrase InhibitorsInsufflationRats, WistarInhalationWakefulnessReflexSleep Apnea SyndromesRegional Blood FlowRespiratory Function TestsLungHematocritCatsNitroimidazolesObesity Hypoventilation SyndromePulmonary Stretch ReceptorsVasoconstrictionBlood Circulation TimeHemodynamicsArteriolesAdaptation, PhysiologicalHypertrophy, Right VentricularEtanidazoleVascular ResistanceChronic DiseaseHypoglossal NerveRespiratory Physiological ProcessesSheepRespiratory SystemUltrasonography, Doppler, Transcranial